FancyBox Gallery

FancyBox Gallery integrates the FancyBox jQuery plugin into the WordPress
gallery functionality. Simply use the gallery shortcode to display
thumbnails in your posts with the option to link directly to the images (not
the attachment template), and the plugin handles the rest. You get nice
popups for the larger sized images, scaled to fit in the browser window,
with a nice overlay effect.

Features:

• Automatically scales large images to fit in window
• Adds a nice drop shadow under the zoomed item
• Groups related items and adds navigation through them (uses preloading)

FancyBox jQuery features, not yet implemented in the WordPress plugin:

• Can display images, inline and iframed content
• Customizable through settings and CSS

ToDo

• Add a settings screen. Allow control of FancyBox display options.
• Let user set their own CSS selector, instead of assuming the standard
  WordPress shortcode.

Credits

The FancyBox jQuery plugin is by Janis Skarnelis, and can be found here:

http://fancy.klade.lv/